Nova Patents
EP1563705B1

Smart dsl system for ldsl

Abstract

A "Smart DSL System" for addressing the performance objectives of LDSL and examples of smart systems for LDSL are disclosed. In accordance with embodiments of the invention, there is disclosed a method for implementing smart DSL for LDSL systems. Embodiments of the method include presenting a number of spectral masks that are available on the LDSL system, and selecting from the number of spectral masks an upstream mask and a downstream mask wherein the upstream mask and the downstream mask exhibit complimentary features. In addition, an evaluation of the spectral compatibility of two LDSL modes based on two different downstream masks, identified herein as LDSL Wide and Narrow, is disclosed. Spectral compatibility is evaluated in accordance with existing rules.

EP1563705B1, drawing sheet 1
Sheet 1 of 71

Term

Term ended

Expired 18 November 2023, 2.9 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

13 claims: 9 independent, 4 dependent

  1. 1
    A method of selecting masks for Long-reach Digital Subscriber Line (LDSL) systems, the method comprising:selecting a spectral mask based upon performance criteria;and activating the selected spectral mask based on at least one of customer premise or central office capabilities characterized in that the spectral mask is spectrally compatible with neighboring services, wherein selecting a spectral mask further comprises: selecting a spectral mask from a number of upstream masks (U1, U2, U3,.., Un) and a number of downstream masks (D1, D2, D3,.., Dn), wherein one of the number of upstream masks is defined by the following relations, wherein f is a frequency band in kHz and U1 is the value of the mask in dBm/Hz: for 0 < f≤4, then U1 = -97.5, with max power in the 0 - 4 kHz band of +15 dB;for 4 < f≤25.875, then U1 =-92.5 + 23.43 x log2 (f / 4);for 25.875 < f≤60.375, then U1 = -29.0;for 60.375 < f≤90.5, then U1 = 34.5 - 95 x log2 (f / 60.375);for 90.5 < f≤1221, then U1 = -90;for 1221 < f≤1630, then U1 = -99.5 peak, with max power in the [f, f + 1 MHz] window of (-90 - 48 x log2 (f / 1221) + 60) dBm;and for 1630 < f≤11040, then U1 = -99.5 peak, with max power in the [f, f + 1 MHz] window of -50 dBm, wherein one of the number of upstream masks is defined by the following relations, wherein f is a frequency band in kHz and U2 is the value of the mask in dBm/Hz: for 0 < f≤4, then U2 = -97.5, with max power in the 0 - 4 kHz band of +15 dBm;for 4 < f≤25.875, then U2 =-92.5 + 22.5 x log2 (f / 4);for 25.875 < f≤86.25, then U2 = -30.9;for 86.25 < f≤138.6, then U2 = 34.5 - 95 x log2 (f / 86.25);for 138.6 < f≤1221, then U2 = -99.5;for 1221< f≤1630, then U2 = -99.5 peak, with max power in the [f, f + 1 MHz] window of (-90 - 48 x log2 (f / 1221) + 60) dBm;and for 1630 < f≤11040, then U1 = -99.5 peak, with max power in the [f, f + 1 MHz] window of -50 dBm, for 1630 < f≤11040, then U2 = -99.5 peak, with max power in the [f, f + 1 MHz] window of -50 dBm.
  2. 6
    The method of one of claims 1 to 5, wherein activating the selected spectral mask is accomplished by a customer premises equipment decision.
  3. 7
    The method of one of claims 1 to 5, wherein activating the selected spectral mask is accomplished by a central office decision.
  4. 8
    The method of one of claims 1 to 5, wherein activating the selected spectral mask is accomplished by a central office decision that overrules a customer premises decision.
  5. 9
    The method of one of claims 1 to 8, wherein one of the number of downstream masks is defined by the following relations, wherein f is a frequency band in kHz and D1 is the value of the mask in dBm/Hz:for 0 < f≤4, then D1 = -97.5, with max power in the 0 - 4 kHz band of +15 dBm;for 4 < f≤25.875, then D1 = -92.5 + 20.79 x log2 (f / 4);for 25.875 < f≤81, then D1 = -36.5;for 81 < f≤92.1, then D1 = -36.5 - 70 x log2 (f / 81);for 92.1 < f≤121.4, then D1 = -49.5;for 121.4 < f≤138, then D1 = -49.5 + 70 x log2 (f / 121.4);for 138 < f≤353.625, then D1 =-36.5 + 0.0139 x (f - 138);for 353.625 < f≤569.25, then D1 = -33.5;for 569.25 < f≤1622.5, then D1 = -33.5 - 36 x log2 (f / 569.25);for 1622.5 < f≤3093, then D1 = -90;for 3093 < f≤4545, then D1 = -90 peak, with maximum power in the [f, f + 1 MHz] window of (-36.5 - 36 x log2 (f / 1104) + 60= dBm;and for 4545 < f≤11040, then U2 = -99.5 peak, with max power in the [f, f + 1 MHz] window of -50 dBm.
  6. 10
    The method of one of claims 1 to 9, wherein one of the number of downstream masks is defined by the following peak values, wherein f is a frequency in kHz and D2 is the peak value of the mask in dBm/Hz:for f = 0.0, then D2 = -98.00;for f = 3.99, then D2 = -98.00;for f =4.0, then D2 =-92.5;for f = 80.0, then D2 = -72.5;for f =120.74, then D2 = -47.50;for f = 120.75, then D2 = -37.80;for f = 138.0, then D2 = -36.8;for f = 276.0, then D2 = -33.5;for f = 677.0625, then D2 = -33.5;for f = 956.0, then D2 = -62.0;for f = 1800.0, then D2 = -62.0;for f = 2290.0, then D2 = -90.0;for f = 3093.0, then D2 = -90.0;for f = 4545.0 then D2 = -110.0 and for f = 12000.0, then D2 = -110.0
  7. 11
    The method of one of claims 1 to 11, wherein one of the number of upstream masks is defined by the following peak values, wherein f is a frequency in kHz and U3 is the peak value of the mask in dBm/Hz:for f = 0, then U3 = -101.5;for f = 4, then U3 = -101.5;for f = 4, then U3 = -96;for f = 25.875, then U3 = -36.30;for f = 103.5, then U3 = -36.30;for f = 164.1, then U3 = -99.5;for f = 1221, then U3 = -99.5;for f = 1630, then U3 = -113.5 and for f = 12000, then U3 = -113.5.
  8. 12
    The method of one of claims 1 to 11, wherein one of the number of downstream masks is defined by the following peak values, wherein f is a frequency in kHz and D3 is the peak value of the mask in dBm/Hz:for f = 0, then D3 = -101.5;for f = 4, then D3 = -101.5;for f = 4, then D3 = -96;for f = 80, then D3 = -76;for f = 138, then D3 = -47.5;for f = 138, then D3 = -40;for f = 276, then D3 = -37;for f = 552, then D3 = -37;for f = 956, then D3 = -65.5;for f = 1800, then D3 = -65.5;for f = 2290, then D3 = -93.5;for f = 3093, then D3 = -93.5;for f = 4545, then D3 = -113.5;and for f = 12000, then D3 = -113.5.
  9. 13
    A system for selecting masks for Long-reach Digital Subscriber Line (LDSL) systems, the system comprising:selecting means to select a spectral mask based upon performance criteria;and activating means to activate the selected spectral mask based on at least one of customer premise or central office capabilities characterized in that the spectral mask is spectrally compatible with neighboring services, wherein selecting a spectral mask further comprises: selecting a spectral mask from a number of upstream masks (U1, U2, U3,.., Un) and a number of downstream masks (D1, D2, D3,.., Dn), wherein one of the number of downstream masks is defined by the following relations, wherein f is a frequency band in kHz and D1 is the value of the mask in dBm/Hz: for 0 < f≤4, then D1 = -97.5, with max power in,the 0 - 4 kHz band of +15 dBm;for 0 < f≤25.875, then D1 = -92.5 + 20.79 x log2 (f / 4);for 25.875 < f≤81, then D1 = -36.5;for 81 < f≤92.1, then D1 = -36.5 - 70 x log2 (f / 81);for 92.1 < f≤121.4, then D1 = -49.5;for 121.4 < f≤138, then D1 = -49.5 + 70 x log2 (f / 121.4);for 138 < f≤ 353.625, then D1 = -36.5 + 0.0139 x (f - 138);for 353.625 < f≤569.25, then D1 = -33.5 - 36 x log2 (f / 569.25);for 569.25 < f≤1622.5 then D1 = -33.5 - 36 x log2 (f / 569.25);for 1622.5 < f≤3093, then D1 = -90;for 3093 < f≤4545, then D1 = -90 peak, with maximum power in the [f, f + 1 MHz] window of (-36.5 - 36 x log2 (f /1104) + 60) dBm;and for 4545 < f≤11040, then D1 = -90 peak, with maximum power in the [f, f + 1 MHz] window -50 dBm, wherein one of the number of downstream masks is defined by the following peak values, wherein f is a frequency in kHz and D2 is the peak value of the mask in dBm/Hz: for f = 0.0, then D2 = -98.0;for f = 3.99, then D2 = -98.00;for f = 4.0, then D2 = -92.5;for f = 80.0, then D2 = -72.5;for f = 120.74, then D2 = -47.50;for f = 120.75, then D2 = -37.80;for f = 138.0, then D2 = -36.8;for f = 276.0, then D2 = -33.5;for f = 677.0625, then D2 = -33.5;for f = 956.0, then D2 = -62.0;for f = 1800.0, then D2 = -62.0;for f = 2290.0, then D2 = -90.0;for f = 3093.0, then D2 = -90.0;for f = 4545.0, then D2 = -110.0;and for f = 12000.0, then D2 = -110.0.
Independent claims9